Question

Unsaturated hydrocarbons contain multiple bonds between the two c-atoms and show addition reactions. Give the test to distinguish ethane from ethene

Answer 1

As ethane is a saturated compound so here the addition reaction does not takes place but ethene is an unsaturated compound and in all unsaturated compounds addition reaction takes place so this test helps you to distinguish between ethan and ethene..

HPOE IT WILL HELP YOU..

Answer 2

Explanation:

Bromine water : In this unsaturated hydrocarbon undergoes addition reaction with liquid bromine to give dibromo alkane as a product.one will observe the discoloration of bromine water when added to the solution of unsaturated hydrocarbon.

• $CH_2=CH_2+Br_2\rightarrow CH_2Br-CH_2Br$

Color of bromine water will fade on adding which indicates the presence of unsaturated hydrocarbon.

• $CH_3-CH_3+Br_2\rightarrow$ no reaction

Color of bromine water will persist on adding which indicates the absence of unsaturated hydrocarbon.